Fig. 5

NRT1.5-inhibited root growth is dependent on auxin polar transport. A Root growth of seedlings (Col, nrt1.5, lks2, and the nrt1.5 complementation line NRT1.5 COM) under MS or LK medium containing auxin analogue NAA or auxin polar transport inhibitor NPA. Four-day-old seedlings were transferred to MS or LK medium containing 30 nM NAA, 60 nM NAA or 10 μM NPA for 3 days, bar = 1 cm. B The lengths of the primary root growth shown in (A). Data are shown as means ± SE (n = 20). Student’s t-test (* P < 0.05; ** P < 0.01) was used to analyze statistical significance